The Fitbit charge 5 activity tracker gives you several functions to keep track of different key metrics during the workout. The strap comes in black, blue or white.
From OnBuy.com
Fitbit Charge 5 Activity Tracker with 6-months Premium Membership Included, up to 7 days battery life and Daily Readiness Score
The product is available from £95.54 at international stores.
Clove Technology
Fitbit Charge 5 - Fitness Band
This product is also available at 8 unverified merchants.